257991706834 has 8 divisors (see below), whose sum is σ = 407355326640. Its totient is φ = 122206597956.

The previous prime is 257991706807. The next prime is 257991706871. The reversal of 257991706834 is 438607199752.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3394627684 + ... + 3394627759.

It is an arithmetic number, because the mean of its divisors is an integer number (50919415830).

It is a 1-persistent number, because it is pandigital, but 2⋅257991706834 = 515983413668 is not.

Almost surely, 2^257991706834 is an apocalyptic number.

257991706834 is a deficient number, since it is larger than the sum of its proper divisors (149363619806).

257991706834 is a wasteful number, since it uses less digits than its factorization.

257991706834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6789255464.

The product of its (nonzero) digits is 22861440, while the sum is 61.

The spelling of 257991706834 in words is "two hundred fifty-seven billion, nine hundred ninety-one million, seven hundred six thousand, eight hundred thirty-four".